Web dividing tapes or spinning tapes for textile machines



A nl 26, 1960 x H. SIEGLING 2,933,775

WEB nxvmmc was 0R smmmc TAPES FOR TEXTILE MACHINES Filed Oct. 1, 1956/NVENTOP the better will the roving be.

nIvInING TAPES R SPINNING TAPES FOR TEXTILE MACHINES Hellmut Siegliug,Hannover, Germany Application October 1, 1956, Serial No. 613,050 2Claims. (Cl. 19--151) This invention relates to spinning tapes or webdividing tapes for textile machines.

The web dividing tapes are provided in the web divider for conveying thewool or fibre web from the comber to the rubbing apparatus, and in thisoperation the web is divided into strips which are preferably as uniformas possible. The web strips are worked to the state of roving. The moreuniform the web strips are, In the web divider there are generally about160 to 180 web dividing tapes. In order that the web in its full extentdoes not become distorted as it is fed along, but can be divided intoequal strips with many edges, the web dividing tapes must all have thesame thickness and must move at the same speed, and must be of likelength and like breadth, must have the same tension sharp edges, andadequate adhering qualities. Another requirement is that there should beno formation of electrostatic charges between tape and web strip.

Web dividing tapes of leather, metal (more particularly steel) rubber,fabric and. other materials arealready known. However, it is diflicultwith leather tapes to comply with the condition that the whole surfaceof the web dividing tapes should travel uniformly, since it is difiicultto produce leather bands'in lengths of several hundred metres so as tohave uniform structure. Oil and fat, which are contained in the web,also have a detrimental efiect on leather tapes-and also on rubbertapes. The spinning lubricants soften the leather and make it spongy. Asa result, not only does the leather tape develop differences inthickness, but it becomes permanently expanded, and the edges of thetapes become rounded or deformed. It is true that permanent elongationof the leather tapes can be compensated for by adjusting the rollers, upto .a certain extent, but since there are usually many web dividingtapes in spinning machines, and the permanent elongation of theindividual tapes differs, the web dividing tapes which have beensubsequently re-tensioned in this way have different tensions from oneanother. Thus, many sag downwards and some become very slack. The amountby which the tapes can be re-tensioned is limited, and there areundesirable interruptions in working if the tapes have to be shortened.Only too often the web dividing tapes can notbe shortened, since theyare always made narrower by each subsequent stretching. As soon as theweb dividing'tapes are reduced in width from their original width and nolonger have sharp edges, the web can no longer be divided up into equalstrips.

The surfaces of leather web dividing tapes are often too rough, so thatsmall fibres of wool remain adhering to the web dividing tapes, and thefibre web or webs lose material. In order to eliminate thisdisadvantage, use is often made of grain leather, which has a relativelysmooth surface. Since the web dividing tapes are gen erally connectedwith one turned through 180 with respect to the other, two tapes havebeen glued together at their flesh sides, so as to give grain sides bothtop and ice bottom. However, the grain side of the belts swells owing tothe influence of spinning lubricants, becomes wavyand fissured, and intime starts to come away in 'istrips, resulting in the web being tornapart. A further disadvantage of leather web-dividing tapes is that theconnection becomes unfastened by the action of the lubricants and theedge-of the connection bends upwards and scratches the web as a resultof which the web loses its uniform structure. Similar phenomena occurif, owing to electrostatic charges, fibres become loosened from the webstrip; alternatively, the whole web strip can only be released from theconveying tape with difliculty.

In order to obviate these difficulties, experiments have already beenmade with steel tapes, and these have also been used in practice. Butsteel tapes have also proved unsatisfactory despite their homogeneityand uniform thickness and sharp edges, since the adhesive power andtherefore the conveying ability of steel conveying tapes is too poor.

Finally, it has also 'been proposed to use polyamide tapes, and to coverthem with leather, cork or the like so as to obtain better adheringqualities. It is true that these web dividing tapes do not expandsubsequently in a permanent manner, owing to their elastic property, nordo they become narrower, but they are not all of equal thicknessthroughout their entire length, and'in the course of time they developblunt edges or their surface is too rough, or, if grain leather is used,the disadvantageous phenomena already described occur.

All these difficulties are obviated by the invention. The inventionconsists in that the Web dividing tape or spinning tape comprisesthreelayers which are welded together, the central layer consisting of apolycaprolactam of the polyamide group, while the outer layers arecomposed of mixed polyamides consisting of 66.6% of hexamethlenediammonium adipate and the balance e-caprolactam, which polyamides aremixed with a plasticiser benzene sulphonic acid methylam-ide with anaddition of a mixture of paraforinaldehyde and benzene sulphonic acidmethylamide.

The middle layer of polycaprolactam with organised molecules ensuresconstant length, width and tension of the tape. The outer layers ofmixed polyamides with plasticisers provide good ability to adhere to theweb strips, and they are completely resistant to oil and fat. Theirsurface is completely uniform; they retain their sharp edges; noelectrostatic charges are produced. The novel tapes can be producedwithout difiiculty to have the same thickness over-their whole extent,and can be connected endlessly in the machine easily and rapidly, evenwhen they are crossed. Moreover, a joint is soft and homogenous and canscarcely be distinguished from of a mixture of paraformaldehyde andbenzene sulphonic acid methylamide.

What I claim is:

1. A multi-layer web dividing tape comprising, a central layerconsisting of polycaprolactam, and two outer layers composed of mixedpolyamides consisting of 66.6% of hexamethylene diammonium adipate andthe balance e-caprolactam, with which polyamides are mixed a plasticiserbenzene sulphonic acid methylamide and with an addition of a mixture ofparaformaldehyde and benzene sulphonic acid methylamide, said centraland outer layers being welded together.

2. A multi-layer web dividing tape or spinning tape comprising, an innerlayer at polyeaprolactam and two outer layers of mixed polyamides weldedto said inner 5 2,244,208

layer; said mixed lpolyam'ides c onsisting of 56.6% of hexeimethylenediammonium adipate and; the bzilnnce e-caprolactam, said mixedpolyamides having had added thereto a plasticiser consisting ofbenzenesulphonie acid methylamide and with an addition of a mixture ofpara- 10 formaldehyde and benzene sillphonic' acid methylamide.

t 4 s References Cited in the file of this patent UNITED STATES PATENTSSchimek Nov. 8, 1927 Miles June 3, 1941 OTHER REFERENCES APC PublicatibnSer. No. 367,723, May 11, 1943.

1. A MULTI-LAYER WEB DIVIDING TAPE COMPRISING, A CENTRAL LAYERCONSISTING OF POLYCAPROLACTAM, AND TWO OUTER LAYERS COMPSOED OF MIXEDPOLYAMIDES CONSISTING OF 66.6% OF HEXAMETHYLENE DIAMMONIUM ADIPATE ANDTHE BALANCE E-CAPROLACTAM, WITH WHICH POLYAMIDES ARE MIXED A PLASTICISERBENZENE SULPHONIC ACID METHYLAMIDE AND WITH AN ADDITION OF A MIXTURE OFPARAFORMALDEHYDE AND BENZENE SULPHONIC ACID METHYLAMIDE, SAID CENTRALAND OUTER LAYERS BEING WELDED TOGETHER.